CRETACEOUS MOLLUSCA. 349 
species of this genus, are numerous and slender in the one before us. The vertex 
is slightly bent forward. 
Fig. 25 represents the cast of the surface in the chalk. 
Avellana. (Tab, XXVII. fig. 34.) 
The toothed aperture and large blunt spire distinguish this from similar shells 
(especially Cassis Avellana of Brongniart) grouped under this genus by D’Orbigny. 
Scalaria compacta. (Tab. XXVII. fig. 32.) 
Spec. Cuar.—Whorls rather square, close; ribs very numerous, slightly 
elevated. 
A very defective specimen is the only one we have seen of this species. 
Solarium catenatum. (Tab. XXIX. fig. 5.) 
Spec. Cuar.—Depressed ; margin smooth?; upper surface of each whorl 
marked with a concentric band of four or five striz, which approach each other 
at regular intervals, so as to resemble an ornamented chain. 
The under surface of this shell is unknown to us. 
Pleurotomaria perspectiva. (Tab. XXVII. fig. 27.) 
This beautiful specimen is from Buriton in Kent. 
Turbo gemmatus. (Tab. XXVII. figs. 26 & 33.) 
Spec. Cuar.—Conical, short, with six spiral, beaded ridges on each whorl 
and about as many on the base, the lower ridges less deeply cut than the two or 
three upper ones ; umbilicus open. 
A common shell in the chalk of Kent. Can it be Cirrus striatus ? of Wood- 
ward’s Geol. of Norfolk, tab. 6. f. 20? 
Turritella turbinata. (Tab. XXIX. fig. 2.) 
Spec. Cuar.—Conical, elongated, concentrically striated ; striz very nume- 
rous ; the lower part of each whorl slightly convex. 
Shorter than most species of Turritella, and the largest of the genus. 
Found in chalk marl. 
bo 
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